I'm not sure what Belton is using to edit, but for the actual audio, there's a freeware program for windows (and maybe mac) called Audacity. It's more or less the audio editing software from Adobe Premier, but slightly easier to navegate. Just download the LAME codec and open up the audio files. Then just edit whatever you need, save as an MP3, and convert it to AAC later in iTunes. I'm not quite sure if that would make things easier or harder, but since you could cut things down to less than a second, it might make the audio cleaner.
Ganbatte, Belton. Your painstaking ideas and editing are nothing short of brilliant.